Sir Paul McCartney is set for a private audience with U.S. President Barack Obama after hinting he’s getting ready for a trip to the White House in an online video conference. McCartney treated fans to a 30-minute webchat on Thursday, during which he talked about upcoming Wings remasters and answered questions posted by followers. But it was a coy comment as he signed off that had watchers scratching their heads. He said, “There’s been some rumours and I think we can give you a clue. Think White House. Think playing… If there is an announcement mentioning the White House, remember where you heard it first.”